WSU Extension

Hortsense

Apple
 
Disease
Anthracnose and Bull's-eye rot 
Bitter pit 
Burrknot 
Crown and collar rot 
Crown gall 
Cytospora canker 
Fire blight 
Fruit russeting 
Nectria canker (European canker) 
Nectria twig blight (Coral spot) 
Perennial canker (Bull's-eye rot) 
Phytophthora fruit rot 
Powdery mildew 
Scab 
Virus diseases 
Insect
Aphids 
Apple ermine moth 
Apple maggot 
Apple-and-thorn skeletonizer 
Brown marmorated stink bug 
Codling moth 
Cutworms and armyworms 
Earwigs 
Fruittree leafroller 
Leafhoppers 
Leafrollers 
Lecanium scale 
San Jose scale 
Spider mites 
Tent caterpillars 
Tentiform leafminer 



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Caption: Severe russeting
Photo by: R.S. Byther
  
Apple : Fruit russeting
(revision date: 5/20/2014)


Biology
Russeting is the appearance of corky, roughened, brownish or grayish areas on apple fruits. There are several possible causes for fruit russeting, including cool wet weather, frost damage, spray damage, powdery mildew infections, and some viral infections. The pattern of the russeting may indicate the cause. Russeting caused by wet weather may be associated with corky lenticels and tan-colored markings, typically raindrop-shaped and concentrated near the stem end of the fruit. Frost russeting often occurs in a band around the fruit. Spray damage russeting is usually concentrated near the bottom of the fruit, where spray collects. Russeting associated with powdery mildew may be tan to gray with a net-like appearance.
Management Options

Non-Chemical Management
  • Plant varieties that are less susceptible to russeting. Red apples generally have little russeting.
  • Control powdery mildew.
  • Use only virus-free wood for grafting.
  • Check spray equipment for proper spray distribution and worn nozzles.
Select non-chemical management options as your first choice!

Chemical Management

None recommended

Images

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Caption: Severe russeting
Photo by: R.S. Byther